Disparities in Spatial Prevalence of Feline Retroviruses due to Data Aggregation: A Case of the Modifiable Areal Unit Problem
Table 3
(a) Disease clusters as identified by the spatial scan test for FIV infections among cats in the US and Canada. (b) Disease clusters as identified by the spatial scan test for FeLV infections among cats in the US and Canada.
(a)
Cluster
Coordinatesa
Radiusb
Obsc
Popd
Expe
Obs/exp
value
State
1
45.894, −73.425
0.00
118
1270
72.56
1.63
<0.01
County
1
41.615, −73.201
191.69
118
1191
69.26
1.70
<0.01
2
53.329, −114.075
0.00
33
462
13.46
2.45
<0.01
3
41.621, −83.653
641.51
345
9648
279.73
1.23
<0.01
4
28.515, −81.324
715.81
84
2545
52.83
1.59
<0.01
5
40.666, −105.461
1163.84
86
2336
52.41
1.64
<0.01
Postal code
1
53.572, −114.046
0.00
25
25
0.70
35.54
<0.01
2
45.578, −73.800
147.14
127
1322
72.45
1.75
<0.01
3
41.650, −83.673
638.28
345
9625
274.98
1.25
<0.01
4
27.817, −82.6777
864.23
101
3085
65.73
1.54
<0.01
5
40.595, −105.129
1123.52
84
2260
49.19
1.71
<0.01
6
40.105, −74.353
109.25
22
645
8.34
2.64
<0.01
Longitude and latitude coordinates of the center of cluster; bradius in kilometers; cobserved number of ELISA positive cats; dtotal number of cats in the cluster; eexpected number of ELISA positive cats under Poisson assumption.
(b)
Cluster
Coordinatesa
Radiusb
Obsc
Popd
Expe
Obs/exp
value
State
1
48.045, −54.689
1437.00
164
2827
93.48
1.75
<0.01
2
45.228, −93.998
637.96
78
1918
47.37
1.65
<0.01
3
34.341, −80.767
999.14
272
10089
209.11
1.30
<0.01
County
1
48.785, −55.986
1381.90
162
2789
90.83
1.78
<0.01
2
47.109, −94.917
660.90
81
1697
43.05
1.87
<0.01
3
34.841, −79.480
932.22
275
9791
209.66
1.31
<0.01
Postal code
1
48.949, −55.634
1403.07
150
2337
75.66
1.98
<0.01
2
46.948, −94.824
545.70
64
1169
31.03
2.06
<0.01
3
34.767, −79.452
936.10
274
9680
206.15
1.30
<0.01
Longitude and latitude coordinates of the center of cluster; bradius in kilometers; cobserved number of ELISA positive cats; dtotal number of cats in the cluster; eexpected number of ELISA positive cats under Poisson assumption.